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Method for identifying transmission line parameters

A transmission line and parameter identification technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of complex transmission line parameters, inaccurate transmission line parameters, and inability to reflect line parameters, etc.

Inactive Publication Date: 2013-04-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The transmission line is the carrier of the power system transmission. The accuracy of its parameters directly affects the final result of the relay protection setting calculation and the selection of the power system operation mode. Great impact, even a major power accident
Therefore, with the continuous development of my country's power system, the requirements for the accuracy of transmission line parameters are getting higher and higher, but transmission line parameters are often more complex and affected by many uncertain factors (climate, environment and geography, etc.). It makes it impossible to obtain the exact values ​​of these parameters only by theoretical calculations, and is limited by various conditions
In addition, the method of blackout test and manual measurement is generally used in the actual measurement of transmission line parameters, which cannot reflect the line parameters under different working conditions.
[0004] However, in practical applications, due to the limitation of the accuracy and real-time performance of the measuring device, it is difficult to obtain the electrical quantity at both ends of the line at the same time, and the online parameter estimation of the transmission line only relies on the state estimation of the SCADA system, which has a huge amount of calculation and is not accurate.

Method used

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  • Method for identifying transmission line parameters
  • Method for identifying transmission line parameters

Examples

Experimental program
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Effect test

Embodiment 1

[0068] In this embodiment 1, a single-circuit 500KV transmission line is built in PSCAD, and the line parameters are set as resistance R=1.916Ω, reactance X=35.180Ω, and all ground capacitance C=2.193uF. The voltage and current vectors, active power and reactive power at both ends of the line are measured as PMU quantities, with a sampling interval of 10ms and a total of 600 sets of data for 6s sampling to identify line parameters. Each data window contains 10 sets of sampling data, a total of 60 data windows.

[0069] Such as image 3 Shown is a schematic diagram of sorting statistics of the line parameter identification results based on PSCAD simulation data in Embodiment 1 of the present invention, and the identification results of each parameter based on median estimation and mean estimation are shown in Table 1 below:

[0070] Table 1

[0071]

[0072] From the results of the two estimates in Table 1 above, it can be seen that when there is no measurement error in th...

Embodiment 2

[0083] In this embodiment, the PMU measured data of a 500KV transmission line of a power grid is used for parameter identification. The 500KV line is a double circuit line. The length of this circuit line is 115.8km. Ground capacitance C=1.505uF. There are two time periods of PMU steady-state data, the measurement error of PMU is relatively small, and the sampling interval is 10ms. The data of each period is 6s, a total of 600 sets of data to identify line parameters; each data window contains 10 sets of sampling data, a total of 60 data windows.

[0084] Such as Figure 5 Shown is a schematic diagram of sorting statistics of line parameter identification results based on PMU measured data in Embodiment 2 of the present invention, and the identification results of each parameter based on median estimation and mean estimation are shown in Table 4 below:

[0085] Table 4

[0086]

[0087] From the identification results based on the PMU measured data in Table 4 above, it ...

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PUM

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Abstract

The invention discloses a method for identifying transmission line parameters. The method comprises the following steps: firstly, establishing a linear equation set for describing a transmission line model according to an equivalent model of a transmission line; dividing multiple sets of sampling data of a PMU (Phasor Measuring Unit) within a period of time into multiple data windows in fixed length; specific to the sampling data of each data window, utilizing a least square method to identify the parameters according to the established linear equation set, thereby obtaining an identifying result under each data window; arraying the identifying results under all the data windows in an ascending sort according to the magnitude sequence of the identifying results, thereby obtaining a row of sequencing statistics; and taking a median of the obtained sequencing statistics as a final parameter identifying result. According to the method, the identified parameters are closer to real parameters of the line and are more credible, and the error resistance is ultrahigh.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a method for identifying parameters of power transmission lines. Background technique [0002] At present, the power system model and parameters are the basis for various calculations and determination of the operation mode of the power sector. The accuracy of the model and parameters is related to the safe and stable operation of the power grid. Stable operation is of great significance. [0003] The transmission line is the carrier of the power system transmission. The accuracy of its parameters directly affects the final result of the relay protection setting calculation and the selection of the power system operation mode. Great impact, and even a major power accident. Therefore, with the continuous development of my country's power system, the requirements for the accuracy of transmission line parameters are getting higher and higher, but transmission line parameters...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 薛安成张兆阳毕天姝杜贵和陈实王正风汤伟胡世骏
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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